There has been major concern about the protective power of immunity against the novel coronavirus. Many people have asked: how long can the immunity, once acquired by the previous infection or vaccination, protect us from the COVID-19 reinfection? 
In February of 2021,…
             
						
						            
            
 
						
						             
						
						             
						
						             
						
						             
						
						             
						
						             
						
						             
						
						            